<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>borde-radio属性说明</title>
    <style>

        /*
        说明:
            1. 这样创建出的图形是一个圆形.
        */
        .my-div-1 {
            width: 200px;
            height: 200px;
            border-radius: 100px;
            background-color: green;
            color: white;
            text-align: center;
        }

    </style>
</head>
<body>
<div class="my-div-1">W3c School</div>
</body>
</html>